Final answer:
An add-in is a program that enhances Microsoft Excel with additional features or commands.
Step-by-step explanation:
A program that adds commands and features to applications such as Microsoft Excel is known as a add-in. Add-ins can provide extra features, enhance performance, or add custom functions to your Excel experience which are not available in the standard installation of the software. These can range from simple utilities to complex programs that transform the capabilities of Excel.
A macro is a program that adds commands and features to applications such as Microsoft Excel. It allows users to automate repetitive tasks by recording a series of steps and then playing them back with a single command or keyboard shortcut. Macros can be used to perform operations like data manipulation, formatting, and generating reports.